Arugula (Eruca vesicaria sativa) is a leafy green herb of the mustard family. Known also as Rocket, Italian Cress, Roquette, and Rucola, Arugula has elongated dark green leaves that are lobed like the leaves of an oak. In the ground, the plant resembles a loose lettuce with long, slender leaves. Arugula is related to both the radish and watercress. Tthe flavor of the leaves is similarly hot and peppery. The leaves can be between 3 and 8 inches (7.5–20 centimeters) in length, depending on the maturity of the leaf. Native to the Mediterranean region, Arugula has been grown as a vegetable since the Roman era. The Romans ate the leaves as a vegetable, used the seeds to flavor oil, and made aphrodisiac and medicinal compounds from the plant.